Red Sea Pro Phosphate Test Kit

In a reef aquarium, the Phosphate level should be checked every week. The concentration should be as low as possible with 0.3 ppm as an absolute maximum for the reef aquarium. Higher concentrations can prevent coral growth and dull colouus and increase algae growt. If levels do exceed over 0.3 ppm then it is recommended to do a water change and treat with a phosphate removal method.